The Synthesis And Modification Study Of The Titanium Dioxide Nanoparticles And MCM-41 Molecular Sieve

With the development of Nano Science and Techology(NanST), more and more study were attend on the nanomaterials. An enormous effort has been dedicated to the study of the inorganic-organic hybrid nanomaterials. Their understanding is of great importance in a number of technological areas, including photocatalysis, semiconductors, and optical sensors. The investigation of metal complexes encapsulated in the pores of molecular sieve materials has attracted much interest in the study of host-guest systems. In this paper, the modified titanium dioxide nanoparticles and mesoporous MCM-41 molecular sieve were synthesized. Their structures and properties were investigated by Fourier-transform inftaed spectroscopy (FT-IR), Ultraviolet spectroscopy-Visable spectroscopy (UV-Vis), Fluorescence spectroscopy (FL), X-ray diffraction (XRD), Transmission electron microscopy (TEM). The main results are followed as:1. Firsftly, we have prepared 6-Aminocaproic acid-capped TiO2 nanoparticles. Their structures and properties were determined by FT-IR, UV-Vis, XRD, TEM. The results show the existence of the organic layer that is connected with the inorganic nuclei by chemical bonds. The average diameter of the nanoparticles is about 50-60nm, the shape is global and the crystal structure is anatase. At present, the way to surface modified the TiO₂ is processed by dye or macromolecule absorber on the surface of the TiO2. The organic layer was not connected with the inorganic nuclei by chemical bonds, but by van der Waals force. In present study the organic layer is connected with the inorganic nuclei by chemical bonds,the composed materials are more stable. At last, we study the stabilization of titanium dioxide nanoparticles.2. We have prepared 2,2'-bipyridine-3,3'-dicarboxylic acid by 1,10-phenanthrolin and synthesized 2,2'-bipyridine-3,3'-dicarboxylic acid capped on titanium dioxide nanoparticles. The results indicate that organic layer is connectedwith the inorganic nuclei by chemical bonds. The average diameter of the nanoparticles is about l00nm, but the crystal structure is not good. It may be due to the bulk of 2,2'-bipyridine-3,3'-dicarboxylic acid molecule. Finally, the structure model for organo-capped titanium dioxide nanoparticles is proposed.3. We prepared hydroxymethyldiphenylphosphine by diphenylphosphine and the Cu(phen)(PPh2CH2OH)2. The structure has been determimed by X-ray single crystal diffraction, and Zn complex has been prepared. At last, the photoluminescence Zn complex encapsulated in mesoporous molecular sieve MCM-41 modified with hydroxymethyldiphenylphosphine displays the blue emission on excitation at 380 nm.